supply of 7/8 (22.2mm) dia zinc plated/galvanized lock bolts7/8 (22.2mm) dia zinc plated/galvanized lock bolts,7/8 (22.2mm) dia zinc plated/galvanized lock bolts with collar (part no. 2820) with grip rang e 31-38, one set consisting of 01 no. lock bolt & 01 no. collar. the head of the lock bolts necessarily be ma rked with manufacture % u2019s identification. the marking on collar should be done on lower bottom surf ace rdsos drg. wd-11036-s-01 and wd-11036-s-02. alt.-nil, specn: base metal-steel. astm b633 and as tm b695 and astm b117 minimum 48 hrs; lock bolt should have a hardness in a range of 28-34 hrc and c ollar have a hardness in a range of 60-80 hrc. [ warranty period: 30 months after the date of delivery ] ]